胶西北巨量金堆积成矿系统时空结构与演化

胶西北在早白垩世发生了爆发式金堆积成矿事件，金矿形成的构造－岩浆背景、成矿热事件及流体来源及成矿机制等显示出明显的地域特色，难以用传统金矿成因模型来诠释。本项目以成矿系统演化为主线，系统剖析胶西北金矿集区区域成矿特征，厘定成矿背景与金矿产出环境；查明胶西北金矿床控矿断裂与矿体浅、深部空间形态特征及其配合关系，建立晚中生代多期应力场构造演化格架及对金成矿的制约；厘清胶西北晚中生代岩浆系统和流体系统演化对金聚集、运移和沉淀的制约机制；确定胶西北金矿床成矿系统的性质、发育、演化，揭示克拉通破坏环境下构造－岩浆－热液作用与巨量金堆积之间的成因联系，揭示成矿规律、完善胶西北(胶东)金矿床成矿模型，为在胶东和类似地区发现新的金矿资源提供理论依据。

A booming event of gold accumulation occurred in the northwestern Jiaodong terrain during a short period of the Early Cretaceous. This spectacular Au metallogeny displays strong peculiarity in several aspects including tectonic-magmatic setting, ore-related thermal anomaly, sources of gold and ore-forming fluids, and mineralizing mechanism. These particular features cannot be readily explained by traditional genetic model of gold deposits. This research project will be centered on understanding the spatio-temporal evolution of the ore-forming systems within the Jiaodong gold province, which will be integrated with analysis of regional geology and metallogenic background. We also seek to constrain the correlation between the multi-phase evolutions of stress fields and gold mineralization during Late Mesozoic by investigating ultimate shapes of the roots of the ore-controlling faults and orebodies. Besides, special attention will be devoted to unraveling potential links between the magmatic-hydrothermal evolution and mechanism of Au accumulation, transportation and deposition. Through detailed characterization of the ore-forming systems, we will reveal the genetic relation between tectonic-magmatic-hydrothermal activities and Au booming event within the geologic context of decratonization. Combining the above endeavor, we will be capable of delineating the underlying patterns of gold metallogeny and improving the genetic model for the northwestern Jiaodong (or even the entire Jiaodong) Au province, which will definitely assist in gold exploration in this region and other similar areas as well.